Cog-wheel with detachable teeth.



No. 653,073. I Patented July 3, I900. G. DURNAUF.

COG WHEEL WlT H DETACHABLE TEETH.

(Application filed July 18, 1899.)

(No Model.)

: STATES GEORG DORNAUF, OF FRANKFORT-ONTHE-MAIN, GERMANY.

COG-=WHE EL WlTH DETACHABLE' TEETH.

SPECIFICATION forming part of Letters Patent No. 653,073, dated July 3, 1900.

Application filed July 18,1899.

T0 aZZ whom, it may concern:

Be it known that I, GEORG DORNAUF, a subject of the King of Prussia, Emperor of Germany, residing at Frankfort-onthe-Main, in the Kingdom of Prussia, Germany, have invented certain new and useful Improvements in Cog-Wheels with Detachable Teeth, (for which I have applied for patents in Germany, dated December 23, 1898; in France, No. 277,936, dated June 16, 1899, and in England, No. 12,617, dated June 16, 1899,) of which the following is a specification.

This invention relates to a cog-wheel with detachable cogs and it consists of a wroughtiron or steel ri in of great comparative strength and lightness, of cogs of wood, metal, or other suitable material, and of wedges securing the cogs in place.

This invention is designed to allow of the cogs of such wheels to be attached, detached, and exchanged with great despatch and reliability and to render the construction of such wrought cog-wheels simple and cheaper than those of wrought-iron, and even cast-iron, at present in use. Cog wheels or rims constructed according to this invention are of great strength and are easily adapted for all purposes.

In order that this invention may be the better understood, Inow proceed to describe the same, reference being had to the accompanying drawings and to the letters marked thereon.

Like letters refer to like parts in the various figures.

Figure 1 is a part-sectional side view of such a rim. Fig. 2 shows a section on the line 2 2 of Fig. 1. Fig. 3 is an enlarged view of a wedge for holding the cogs in place. Fig. 4 is an enlarged view of a single cog.

The rim A of the wheel shown in the drawings is made of a bar of channel-iron bent on a bending-machine to form a ring. The abutting ends may be held together by any suitable means. The rim thus formed has therefore a groove open in the direction where the cogs are to be attached.

In ordinary spur-wheels the groove will be situated on the-outside periphery, in internally-geared wheels it will be on the inner periphery of the rim, in crown-wheels it will Serial No. 724,287. (No model.)

be on the side of the wheel, and in bevelwheels it will be in a corresponding position. Cogs B, Fig. 4., are inserted in this groove, (see Fig.2) and have, preferably, projections at their outer portions which overhang the flanges of the rims of the wheels, so that they are flush with the outer sides of the rim A.. However, these projections are not absolutely necessary. In fact, they cannot be adopted in some cases for instance,in the case of flanged wheels where the flanges extend on or over the cogs. Wedges (3, Fig. 3, are placed between the cogs B and attached by screwed studs a, passing through holes in the web of the channel-iron groove, and by nuts 0, screwed thereon.

The curves of the cogs are constructed in the same manner as wheels with fixed teeth, regard being paid to the division and size of the wheel. The curves are extended to the bases of the teeth. In this manner the lower parts of the cogs are determined, which parts are not engaging or working surfaces of the cogs. The base edges of the cogs abut against each other, and thus prevent independent movement of the cog. Between the lower curved surfaces of the adjacent cogs are inserted the before-mentioned wedges C, of corresponding outlines. The flanks of the cogs B have recesses b to receive the studs 0 of the wedges Q, Therefore the cogs B are secured in position and against movement by their abutting base edges by wedges O, fitted between the cogs and secured to the rim by screws and by the sides of the channel-iron.

It will be obvious that the cogs may be constructed so as to adapt them to a wheel of any diameter.

The cogs B are made of a material suitable for the purpose for which the cog-wheel is to be used.

These cog-wheels are intended, primarily, to be used without spokes for the ends of rotating receptacles, but they may also be constructed with spokes and bosses.

WVhat I claim, and desire to secure by Letters Patent of the United States, is

1. A cog wheel or riin, having a ring A of channel-section, cogs B of suitable construction, and wedges O screwed to the ring A by studs 0 and nuts 0 between the cogs so as to hold the latter securely in position and to cogs or teeth to bind them together, and means allow of their easy attachment or removal, extending from the wedges through the rim substantially as described. of the wheel by which to hold the wedges in 2. A gear-wheel having a rim, cogs or teeth position, 5 mounted on said rim, wedges fitting between In testimony whereof I have hereunto set I 5 the dogs or teeth and binding them together, my hand in the presence of two witnesses.

and bolts attached to the wedges and fastened GEORG DORNAUF. through the rim. Witnesses:

3. A gear-wheel having a rim, cogs or teeth JEAN GRUND,

10 mounted thereon, wedges fitted between the WILLEY ECKERT. 

